Earn the "The Collector" achievement in the Dead Ops Arcade mode of Call of Duty: Black Ops with this gamer's guide! In order to unlock this achievement, you will need to buy every weapon off the wall during a single Zombie level.

Call of Duty 7 (COD: BO) is the seventh installment in Activision's popular Call of Duty series of military-themed first-person shooter video games and the first to be set during the Cold War. COD7 is available for the PC, Xbox 360, PlayStation 3 (PS3) and Nintendo Wii.